Messages in this thread Patch in this message | | | From | Ingo Molnar <> | Subject | [PATCH 39/52] tools/perf/build: Automatically build in parallel, based on number of CPUs in the system | Date | Tue, 8 Oct 2013 12:11:09 +0200 |
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Implement automatic parallel builds when building in tools/perf:
$ time make
# [ perf build: Doing 'make -j12' parallel build. ]
Auto-detecting system features:
...
real 0m9.265s user 0m59.888s sys 0m6.082s
On GNU make achieving this is not particularly easy, it requires a separate makefile, which then invokes the main Makefile.
( Note: this patch adds Makefile.parallel to show the concept - the two makefiles will be flipped in the next patch to avoid having to specify -f to get parallelism in the default build. )
Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/n/tip-dvBjwqiTyzrufzkz8oanhpf9@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> --- tools/perf/Makefile.parallel | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/tools/perf/Makefile.parallel b/tools/perf/Makefile.parallel new file mode 100644 index 0000000..ec5e08b --- /dev/null +++ b/tools/perf/Makefile.parallel @@ -0,0 +1,26 @@ +# +# Do a parallel build with multiple jobs, based on the number of CPUs online +# in this system: 'make -j8' on a 8-CPU system, etc. +# +# (To override it, run 'make JOBS=1' and similar.) +# +ifeq ($(JOBS),) + JOBS := $(shell grep -c ^processor /proc/cpuinfo 2>/dev/null) + ifeq ($(JOBS),) + JOBS := 1 + endif +endif + +export JOBS + +$(info $(shell printf '# [ perf build: Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel build. ]\n')) + +# +# Needed if no target specified: +# +all: + @$(MAKE) --no-print-directory -j$(JOBS) $@ + +%: + @$(MAKE) --no-print-directory -j$(JOBS) $@ + -- 1.8.3.1
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